CVE-2026-19823 Tenda W20E QoS Rule Deletion delQos formQOSRuleDel stack-based overflow
Remote attackers can trigger a stack-based buffer overflow in the QoS rule deletion function of Tenda W20E routers, potentially leading to code execution.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-19823?
CVE-2026-19823 is a high-severity memory corruption vulnerability in Tenda W20E, published on 14 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
A security flaw has been discovered in Tenda W20E 15.11.0.6(1068_1546_841)_CN_TDC. Impacted is the function formQOSRuleDel of the file /goform/delQos of the component QoS Rule Deletion. Performing a manipulation of the argument qosIndex results in stack-based buffer overflow. Remote exploitation of the attack is possible. The exploit has been released to the public and may be used for attacks.
Which versions are affected by CVE-2026-19823?
How do I fix CVE-2026-19823?
No fix has been published for CVE-2026-19823 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-19823 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-19823 exists.
Sources
Also known as GHSA-xrpr-8h65-75q6.